1. The difference between the instantaneous frequency of a digital signal and the long-term average frequency of that signal. [T
1. Rpt17-1993]
2. An unintentional deviation from the nominal frequency value.

1. The amount by which a frequency differs from a prescribed value, such as the amount an oscillator frequency drifts from its nominal frequency.
2. In frequency modulation, the absolute difference between (a) the maximum permissible instantaneous frequency of the modulated wave or the minimum permissible instantaneous frequency of the modulated wave and (b) the carrier frequency.
3. In frequency… (Read More →)

An electronic counter-countermeasure (ECCM) in which communications nets' operating frequencies are widely separated from each other, causing a requirement to spread jamming power over wider frequency bands and thus compelling a reduction of available jamming power on any single channel or frequency, or causing a requirement for more jamming power or more jamming equipment. [From Weik '89]

The end-to-end shift in frequency that may result from independent frequency translation errors in a circuit.

Synonym amplitude-vs. -frequency distortion.

Transmission and reception in which the same information signal is transmitted and received simultaneously on two or more independently fading carrier frequencies.

An undesired progressive change in frequency with time.
Note 1: Causes of frequency drift include component aging and environmental changes.
Note 2: Frequency drift may be in either direction and is not necessarily linear.

A short-term variation, with respect to time, of the frequency of an oscillator.
Note: Frequency fluctuation, f(t), is given by where (t) is the phase angle of the sinusoidal wave with respect to time, t.

A deviation of frequency that generally results from irregular motion of the recording medium during the recording, duplication, or reproduction. [T1.401-1988] Synonym [loosely] flutter.

1. The interchanging of the frequencies of carrier channels to accomplish specific purposes, such as to prevent feedback and oscillation, to reduce crosstalk, and to correct for a high frequency-response slope in the transmission line.
Note: Frequency frogging is accomplished by having modulators, which are integrated into specially designed repeaters, translate a low-frequency group to a high-frequency group, and vice… (Read More →)